There is no real difference in the pixel size. Certainly nothing that could be responsible for a visible IQ difference. If the 6D proves to have higher SNR per pixel...which I highly doubt...it will be due to other design/fabrication changes.

More than likely the tiny difference in MP is due to design changes to increase wafer yields. It's even possible that 6D pixels are the same size as 5D3 pixels or a bit smaller if this is the case.

Before we get too excited however the 1Dx has gap-less micro lenses, and I'm not sure if the same can be said for the other two?

At least the 5d3 does, I vividly remember people writing when realizing that the 5d3 sensor isn't a large leap as expected from the 5d2 "... but ... but ... it has gapless microlenses!" :-> ... Personally I don't care if it has orange-juice powered plutonium-afterburners as long as it delivers (or not).

There are rumors flying around that parts of the 6D sensor are made using a new production technology.

Wow, that's exciting and exactly what a rumors site is supposed to be about - my theory: the new tech is something to cut back costs so that Canon can get a higher profit margin with the 6d over the 5d2!

It's not the same sensor. Canon's web site describes it as a new design.

Of course it's not the same - it's 20 MP, not 22 MP. But if it uses the same production technologies found in the 5DIII and 5DII, the IQ should only be marginally different, if at all.

+1 as Neuro stated (20MP vs 22MP)

Prior to my 5D III, I owned & used 40D, 60D, 7D, 5D II and tested and owned a lot of lenses. My comments are based on hand-on-experience, not what I heard and read on internet and interpret to this forum.

How often to hear people give advices or comments on FF gear, while they shooting crop. Reality is.... you get for what you pay for.

I can see another post with title like this soon: 6D + 24-70 f4 IS is out perform 5D III + 24-70 f2.8 II

The math doesn't seem to add up, $2100 body is perform better than $3500 in high ISO with same sensor.

It's not the same sensor. Canon's web site describes it as a new design.

What's a "new design"? Sony technology?[/quote

Could be... hehehe! or the one they incorporated with the super high MP camera they'll be releasing next year. Maybe, they made 6D as their "trial" ground. We'll be able to verify it only on December so stay tuned...

As for a cheaper camera outperforming a more expensive camera in terms of IQ, this will not be the first time Canon will be doing it if 6D outperforms 5D3 in terms of IQ. Even Nikon is capable of doing that. After all, it's not all about IQ. Right? Determining what makes one camera better than another camera body depends on a lot of factors (e.g., AF, build quality, etc...). 5D3 may be outperformed a little bit in the IQ department but it is still a lot better camera than 6D.

I wonder if the 6D has some type of built-in NR that is always on since it's supposed to be more of a prosumer camera and maybe that's why it looks better? Like how video from a DSLR may look better than raw footage from a RED camera if you're just looking at what comes out of the camera. But grade the RED footage and then compare and it's no contest.

Either way it's pretty awesome that the performance is there, alot of people (especially here) have been dogging on this thing since the moment they saw the spec sheet. But hey for over $2k I'd hope it would be halfway decent. Even if the image quality does match the 5D3 there are still plenty of good reasons to go with the 5D3. I wouldn't be surprised if Canon deliberately went with the 11pt AF because anything higher would have put it too close to the 5D3 (30 vs 61 doesn't sound too bad, but 11 to 61 sounds like a massive difference).

It just dawned on me that I may actually pick up one of these to replace my 5D2, now I'm kinda excited.

PS. I slowly became more and more incapacitated as I wrote this, my apologies if it's incoherent.

I can see another post with title like this soon: 6D + 24-70 f4 IS is out perform 5D III + 24-70 f2.8 II

you make me want to sell my 5d iii... LOL... nah, i am keeping it though even if number of people turns out to say like that in this forum. i am pretty sure that 6d cannot match 5d mark iii though... why, because canon is a big corporation. it knows the way of runnin' its bussiness...